The British office for nuclear regulation (ONR) has approved 2 February 2015 the request of the EDF Nuclear Generation Ltd. to extend the life of the Sizewell B until 2025.

The Sizewell B unit has been commissioned in September 1995 and is equipped with pressurized PWR reactor of 1191 MWe power.

The reactor design is based on the SNUPPS four-loop PWR of Westinghouse.

Unlike the American units of this project, the British project added some additional safety features, such as passive emergency borated system coupled with all four loops through cold legs and intended for injection in the first circuit of the boric acid solution with a concentration of 7000 ppm.

The containment of Sizewell B was also redesigned compared to the original American project, as required to accommodate additional equipment and to bring the project to the British standards for safety margins.

The reactor facility BN-350 is the first facility with the fast neutron reactor. Experience of its designing, building, installing and exploitation has helped to realize and solve many problems with NPPs of a fast sodium type.

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